Detective Comics, Vol. 5: The Joker War (TPB)

The Clown Prince of Crime has unleashed a wave of friends, foes, and failures to attack Gotham’s protector from the inside out. First up is Harvey Dent, a.k.a. Two-Face, whose violent impulses the Joker has amplified to deadly new heights–unleashing a cadre of zealots known as the Church of the Two on Gotham City!